Working with Age Comparison Results for Individual Fish

Short descriptions of two new functions related to cumsum() ... pcumsum() for cumulative sums not including the currrent value and rcumsum() for "reverse" cumulative sums.

Use new functions in the FSA package, along with the dplyr package, to add Gabelhouse length categories and relative weights for all species in a data.frame.

Update example of use of lencat() from the FSA package with dplyr.

Updated example of using dplry with fish data.